[R] Newbie question : selecting subset of a Matrix

thocar at free.fr thocar at free.fr
Wed Nov 7 23:20:05 CET 2012


I have a matrix, I would like to use it like I use where query on an SQL table

Let's say my matrix is

> wok
    who  task
1   joe task1
2   joe task2
3   joe task3
4  jack task1
5  jack task2

I want to extract a matrix that contains only rows where
    who = "joe" and task != "task2"

The result would be the following matrix

1   joe task1
2   joe task3

How can I do that with R ?



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